Command output parsing in Python

import subprocess
output = subprocess.check_output("ipconfig /displaydns", shell=True)
result = {}
for row in output.split('\n'):
    if ': ' in row:
        key, value = row.split(': ')
        result[key.strip(' .')] = value.strip()

print(result)
print(result['A (Host) Record'])

gives:

{'A (Host) Record': '127.0 .0.16', 'Data Length': '4', 'Section': 'Answer', 'Record Name': '9.a.c.e.x-0.19-430f5091.531.1518.1b8d.2f4a.210.0.k1m2t5a3245k242qmfp75spjkv.avts.', 'Time To Live': '289', 'Record Type': '1'}
127.0 .0.16

Another solution would be to: (when i thought of this in my head, i thought it would be more compact.. it wasn't but anyway, it's a different way of calling the external command where you get control of the errors and output (you can differntiate the two))

import subprocess
cmdpipe = subprocess.Popen("ipconfig /displaydns", stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
result = {}
for row in cmdpipe.stdout.readline():
    if ': ' in row:
        key, value = row.split(': ')
        result[key.strip(' .')] = value.strip()

# You need to close the file handles, as they will stay open "forever" otherwise.
cmdpipe.stdout.close()
cmdpipe.stderr.close()

print(result)
print(result['A (Host) Record'])

I'll also add that using shell=True might be dangerous especially when combined with user-input. It does add some "hidden magic" to make some things easier or more user-natural. But in most cases you will want to do subprocess.Popen(["ipconfig", "/displaydns"], stdout=subprocess.PIPE, stderr=subprocess.PIPE) instead.